package com.example.rabbitmq.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.*;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;


/**
 Broker:它提供一种传输服务,它的角色就是维护一条从生产者到消费者的路线，保证数据能按照指定的方式进行传输,
 Exchange：消息交换机,它指定消息按什么规则,路由到哪个队列。
 Queue:消息的载体,每个消息都会被投到一个或多个队列。
 Binding:绑定，它的作用就是把exchange和queue按照路由规则绑定起来.
 Routing Key:路由关键字,exchange根据这个关键字进行消息投递。
 vhost:虚拟主机,一个broker里可以有多个vhost，用作不同用户的权限分离。
 Producer:消息生产者,就是投递消息的程序.
 Consumer:消息消费者,就是接受消息的程序.
 Channel:消息通道,在客户端的每个连接里,可建立多个channel.
 * RabbitMQ配置类
 * @date 2019-4-6 15:55:46
 * @author joker
*/
@Slf4j
@Configuration
public class RabbitConfig {

    @Value("${spring.rabbitmq.host}")
    private String host;

    @Value("${spring.rabbitmq.port}")
    private Integer port;

    @Value("${spring.rabbitmq.username}")
    private String username;

    @Value("${spring.rabbitmq.password}")
    private String password;

    public static final String EXCHANGE_A = "my-rabbitmq-exchange_A";
    public static final String EXCHANGE_B = "my-rabbitmq-exchange_B";
    public static final String EXCHANGE_C = "my-rabbitmq-exchange_C";

    public static final String QUEUE_A = "QUEUE_A";
    public static final String QUEUE_B = "QUEUE_B";
    public static final String QUEUE_C = "QUEUE_C";

    public static final String ROUTINGKEY_A = "spring-boot-routingKey_A";
    public static final String ROUTINGKEY_B = "spring-boot-routingKey_B";
    public static final String ROUTINGKEY_C = "spring-boot-routingKey_C";

    public static final String TOPIC_A = "topic.A";
    public static final String TOPIC_B = "topic.B";
    public static final String TOPIC_ALL = "topic.#";



    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory(host, port);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        connectionFactory.setVirtualHost("/");
        connectionFactory.setPublisherConfirms(true);
        return connectionFactory;
    }

    /**
     * 必须是scope类型
     * @return RabbitTemplate
     */
    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public RabbitTemplate rabbitTemplate() {
        return new RabbitTemplate(connectionFactory());
    }

    /**
     * 针对消费者配置
     * 1、设置交换机类型
     * 2、将队列绑定到交换机上
     * FanoutExchange: 将消息分发到所有的绑定队列，无routingkey的概念
     * HeadersExchange ：通过添加属性key-value匹配
     * DirectExchange:按照routingkey分发到指定队列
     * TopicExchange:多关键字匹配
     * @return DirectExchange
     */
    @Bean
    public DirectExchange defaultExchange(){
        return new DirectExchange(EXCHANGE_A);
    }

    /**
     * 获取队列A
     * @return Queue
     */
    @Bean
    public Queue queueA(){
        return new Queue(QUEUE_A, true);
    }

    /**
     * 一个交换机可以绑定多个消息队列，
     * 也就是消息通过一个交换机可以分发到不同的队列中去
     * 将队列与交换机绑定，设置路由规则
     * @return Binding
     */
    @Bean
    public Binding binding(){
        return BindingBuilder.bind(queueA()).to(defaultExchange()).with(ROUTINGKEY_A);
    }


    /**---------------------------------topic exchange-----------------------------------*/
    @Bean
    public TopicExchange topicExchange(){
        return new TopicExchange(EXCHANGE_B);
    }

    @Bean
    public Queue queueB(){
        return new Queue(QUEUE_B);
    }

    @Bean
    public Queue queueC(){
        return new Queue(QUEUE_C);
    }

    @Bean
    public Binding bindingTopicA(){
        return BindingBuilder.bind(queueB()).to(topicExchange()).with(TOPIC_A);
    }

    @Bean
    public Binding bindingTopicB(){
        return BindingBuilder.bind(queueC()).to(topicExchange()).with(TOPIC_ALL);
    }
}
